Thanks a lot, that was it. After fail & remove one HD, set --raid-devices=2 and re-add the removed HD as spare, the --grow worked. Regards, Hans Am 08.05.2015 um 12:47 schrieb Robin Hill:
On Fri May 08, 2015 at 11:18:44AM +0200, Hans Kraus wrote:Hi, I have a Raid 1 with 3 drives, the following layout (the internal bitmap is already removed): ----------------------------------------------------------------- md20 : active raid1 sdj1[2] sdi1[1] sdn1[0] 732442432 blocks super 1.2 [3/3] [UUU] ----------------------------------------------------------------- I tried to change it to Raid 5, but I'm getting aways an error. ----------------------------------------------------------------- mdadm --grow /dev/md20 --level=5 --raid-devices=3 -c 32 \ --backup-file=/home/kraush/work/raidLevelChange Impossibly level change request for RAID1 ----------------------------------------------------------------- I tried it with various permutations (+/- raid-devices, c, ...). Is something in my command wrong or is the level change not possible? This is on Debian 7, mdadm - v3.3-65-g2167de7 - 11th March 2014I think you'll need one of the disks to be spare first. Try reducing the RAID1 to a 2-disk plus spare configuration, then rerunning the grow. Alternately you'd need to add a new disk as a spare first, then grow to a 4 disk RAID5. HTH, Robin
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